A Dictionary of Modern English Usage (1926), by Henry Watson Fowler (1858–1933), is a style guide to British English usage, pronunciation, and writing. Covering topics such as plurals and literary technique, distinctions among like words, and the use of foreign terms, the dictionary became the standard for other style guides to writing in English. Hence, the 1926 first edition remains in print, along with the 1965 second edition, edited by Ernest Gowers, which was reprinted in 1983 and 1987. The 1996 third edition was re-titled as The New Fowler's Modern English Usage, and revised in 2004, was mostly rewritten by Robert W. Burchfield, as a usage dictionary that incorporated corpus linguistics data; and the 2015 fourth edition, revised and re-titled Fowler's Dictionary of Modern English Usage, was edited by Jeremy Butterfield, as a usage dictionary. Informally, readers refer to the style guide and dictionary as Fowler's Modern English Usage, Fowler, and Fowler's.

Henry Watson Fowler was an English schoolmaster, lexicographer and commentator on the usage of the English language. He is notable for both A Dictionary of Modern English Usage and his work on the Concise Oxford Dictionary, and was described by The Times as "a lexicographical genius".